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Intrinsically Microporous Polyimides Based on a Rigid-Soft Structure for Hydrogen Separation.
ACS Appl Mater Interfaces
January 2025
School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.
Polyimide (PI)-based gas separation membranes are of great interest in the field of H purification owing to their good thermal stability, chemical stability, and mechanical properties. Among polyimide-based membranes, intrinsically microporous polyimides are easily soluble in common organic solvents, showing great potential for fabricating hollow fiber gas separation membranes. However, based on the solution-diffusion model, improving the free volume or the movability of polymer chains can improve gas permeability, but would result in poor thermal stability.
View Article and Find Full Text PDFIt's a good thing that severely hypoxic salmon (Salmo salar) have a limited capacity to increase heart rate when warmed.
J Exp Biol
January 2025
Department of Ocean Sciences, Memorial University of Newfoundland and Labrador, St. John's, NL. A1C 5S7, Canada.
With climate change, fish are facing rising temperatures, an increase in the frequency and severity of heat waves and hypoxia, sometimes concurrently. However, only limited studies have examined the combined effects of increases in temperature and hypoxia on fish physiology and survival. We measured the cardiorespiratory physiology of 12°C-acclimated Atlantic salmon when exposed acutely to normoxia [100% air saturation (sat.
View Article and Find Full Text PDFEffects of thermal aging on the performance of ordinary and novel superhydrophobic and oleophobic ultra-fine dry powder extinguishing agent.
Sci Rep
January 2025
School of Safety Science and Engineering (School of Emergency Management), Nanjing University of Science and Technology, Nanjing, 210094, People's Republic of China.
Powder-based fire extinguishing agents have become a kind of promising substitutes for halon extinguishing agents in civil aircrafts. However, their storage lifespan, significantly influenced by the thermal aging, emerges as a crucial yet overlooked aspect for aviation use. This study investigates the effects of thermal aging cycles on various parameters of ordinary dry powder extinguishing agent (ODPEA) and novel superhydrophobic and oleophobic ultra-fine dry powder extinguishing agent (SHOU DPEA), including surface microscopic morphology, D90 (the diameter at which 90% of the cumulative volume of particles are equal to or smaller than this value), chemical structure, hydrophobic and oleophobic angles, flowability, extinguishing time and effectiveness.
View Article and Find Full Text PDFPreparation and characterization of chitosan/bacterial cellulose nanofibers-based food packaging films blended with aqueous phase from purple passion fruit peel via hydrothermal carbonization.
Int J Biol Macromol
January 2025
College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China. Electronic address:
Purple passion fruit peel (PPFP) is a common biomass waste. Meanwhile, hydrothermal carbonization (HTC) is a common technology used for thermal conversion of biomass waste. Herein, the aqueous phase (AP) of PPFP was determined using HTC, and its properties were studied.
View Article and Find Full Text PDFEnhanced production, functionalization, and applications of polyhydroxyalkanoates from organic waste: A review.
Int J Biol Macromol
January 2025
Department of Chemical and Environmental Engineering and Pro-Vice-Chancellor (Planning & Resources), University of Mauritius, Reduit, Mauritius.
Polyhydroxyalkanoates (PHAs) represent a promising class of biodegradable polyesters synthesized by various microorganisms as energy storage compounds. Their versatility and environmental friendliness make them potential candidates for replacing conventional plastics across numerous applications. However, challenges such as limited mechanical properties, high production costs, and thermal instability have hindered their widespread adoption.
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